How many PCI Express Slots has a Dell GX620 Mini Tower

Hi, I Want to know how many pci slots the gx620 in mini tower version has, because, I Need to add a sound card due to the integrated audio not working, and also I Want to know if it supports a Video Card and a Sound Card together, or if I Need to buy a USB Sound Card. Thanks

1. Go to Start menu, and type device manager in search box;2. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in UNINSTALL.3. Restart system...4. Go to Star menu, and type device manager in search box;5. Click in "Device Manager", open Sound, video and game controllers, right click in driver, and click in Update driver.6. Click in Browser in my computer and click in "Let me pick from a list..."7. Click in Sound, video and game controllers, if not show this, skip this step.8. Click in button HAVE A DISK, and click in Browser, go to folder SoundMax in desktop, and click in amd64, double-click in smwdmICH5.inf and press OK BUTTON.9. AD1888 have a 6-channel sound, click in second "SoundMax Integrated Digital Audio" item.